Balanced Diets

By the end of the lesson I will:

•Be able to: describe the contents of a balanced diet and the uses of nutrients in the body.

•Be able to understand: how an unbalanced diet can lead to malnourishment.

•Be able to apply in the following way: complete the balanced diet activity.

Quick Thinker

Ten people exercising give out the same heat as a gas fire.Where does this energy come from?

FOOD!

Do all foods contain the same energy?

Balanced Diets• Most people eat a balanced diet. • A balanced diet contains all of the following:• carbohydrates for energy• fats for energy and making cell membranes• proteins for growth (making new cells), repair and energy• vitamins and mineral ions for keeping healthy• roughage (fibre) to keep the digestive system working well• water to transport other nutrients.

If a person does not have a balanced diet they can become malnourished. What do you think this means?

Food and Nutrients

• When we talk about a balanced diet we need to use the terms food and nutrients.

• Foods contain nutrients in different amounts.• What kinds of nutrients would milk, bread and

bacon contain?• Milk – protein, fat, minerals, carbohydrates.• Bread – carbohydrates, proteins and minerals• Bacon – protein, minerals, fat

Metabolism

• Metabolic rate is the rate at which chemical reactions take place in the body.

• Different people have different metabolic rates.

• Men have faster metabolic rates than women.• Young people have faster metabolic rates than older people.• The greater the proportion of muscle to fat in the body, the

higher the metabolic rate is likely to be.• Metabolic rate can be affected by your genes, too. These are

inherited from your parents.

Dieting

The best way to lose body mass is dieting.Dieting plans should have a balanced diet, but in smaller amounts and should be followed up with exercise. Why do you think exercising is important when dieting?Why would this be a goodmeal for someone whois dieting?